1. The initial resolution or petition providing for the issuance of bonds, whether adopted by a majority vote of the school board of a school district or proposed by the qualified electors of the school district as provided for in section 21-03-10, may, within the discretion of those proposing such initial resolution or petition, provide for a specific school plan for which the proceeds of the bond issue must be exclusively used except as otherwise provided in section 21-03-42. Such plan must designate the general area to be served by expenditure of bond proceeds for school purposes. The area intended     to be served must be described in the plan, but need not be described in the bond election ballot.

2. A bond election ballot form in substantially the form prescribed in section 21-03-13 must be used in a school district bond election. After approval of the initial resolution by the number of qualified electors required by section 21-03-07, the proceeds of the bond issue may be used only for the purpose and in the manner designated by the school plan except as herein provided.

3. After approval of the bond issue, no change may be made in the purpose of expenditure of the bond proceeds except that, upon a favorable vote of sixty percent of the qualified electors residing in any specific area intended to be served as provided in subsection 1, material changes may be made in such plan as it affects said area to the extent such changes do not conflict with contractual obligations incurred.